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Answer Posted / sunil kumar sinha
Ohms law is applicable where there is no induction/
inductance. It is applicable where only resistance is
present. This can happen in D.C. Circuit and ohm's law is
100% applicable in D.C. circuit. In A.C. circuit, impedence
which consist of resistance and inductance is applicable as
load. i.e r+jwL. The inducatance depends on frequency of
system and L (henery).
D.C Circuit : C = V/R, where C is current, V is voltage, R
is resistance
A.C. circuit C = V/Z where Z = R+JWL. Z is impedence, L is
inductance.
Transformer works on the principle of induction and has no
of coils both in the primary and secondary windings.Hence
very high inductance and very low resistance. Here
Impidence (Z) is very close to wL both in primary and
secondary windings as resistance is very low in both the
windings. Hence the transformer circuit does not obey ohm's
law.
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